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Most likely what happened is some trash got into the line and contaminated the backflow, in which case it starts to dump water.

You can open up the backflow and see if anything is obstructing the plunger. When you put it back together try closing the discharge side of the backflow then open the inlit side of the backflow as soon as possible this will allow the water to seal the plunger as quickly as possible.rich@sprinklerresource.com

Is this backflow really brand new?

One contractor sold us this stuff for $505 and claimed it’s brand new, I feel a little bit skeptical.... why it’s powdered white in the middle, not like what I saw on amazon all brass? any idea? Thanks.

You are probably looking at Zinc Oxide. The temperatures for casting brass are fairly close to the melting point of zinc, so a bit of zinc might migrate to the surface of the cast part, where it can later oxidize. Do not worry about it.